Lindsey Vonn was caught cheating on boyfriend Tiger Woods, according to a report by the National Enquirer.

Woods was caught in a cheating scandal back in 2009, when he was forced to admit his infidelity after a string of women came forward to say they had an affair with the professional golfer when he was still married to Elin Nordegren.

“Lindsey is not a nun,” a source told the National Enquirer. “She’s a very physical, very attractive young woman with a very strong athlete’s ego. She wants her own fame – not his. Now it looks like she’s checking out the field.”

An eyewitness says Vonn cheated on Woods with an older man at a Justin Timberlake, Jay-Z concert in Miami on Aug. 16. They were backstage reportedly making out, RadarOnline reports.

“She threw herself into his arms and they started on a long session of deep kissing that went on for several minutes,” said the source. “He was a tall, good-looking man, in his mid-40s, with graying temples. They were really going at it. They were both holding drinks, and Lindsey’s free hand was around his neck, drawing him closer, while his hand was gripping her rear end.”

Vonn posted a picture on Instagram from the concert, writing, “Wow that was amazing! Best concert I've ever been to! #legends #bestrapperalive #jay-z.”

The Olympic skier was in Miami for a “LVTakesMiami” promotion and photoshoot for Redbull, one of her sponsors.